What does 'TEMPO' indicate within a TAF?

The term 'TEMPO' within a Terminal Aerodrome Forecast (TAF) indicates a temporary change in weather conditions that is expected to occur within a specified timeframe, usually lasting less than an hour. This is particularly relevant for pilots and meteorologists, as ‘TEMPO’ provides critical information about fluctuations in weather that may impact flight operations over brief periods. These temporary changes can include shifts in visibility, wind, precipitation, or cloud cover, allowing pilots to prepare for possibly changing conditions during their flight or approach.

The use of 'TEMPO' helps in differentiating short-lived weather phenomena from more persistent conditions described elsewhere in the TAF, which reflect ongoing or more permanent forecasts for the area. Understanding this distinction is crucial for interpreting TAFs accurately and ensuring safe flight operations.